Flutter path_provider Production Storage Engineering

Treat path_provider as a directory-location resolver, not as a storage policy, filesystem, database, encryption layer, cache manager, sharing API, or durability guarantee. Choose storage from data semantics first:

lifecycle
+ recoverability
+ ownership
+ user visibility
+ backup policy
+ sensitivity
+ size
+ platform support
→ directory category
→ I/O strategy
→ cleanup/migration/security policy